(BROOKLYN, NY) Arrest Made in Shootings Near a Brooklyn Basketball Tournament

A 20-year-old man was arrested on Sunday in connection with a gang-related shooting that killed an 18-year-old man and critically injured a 13-year-old boy near an annual Brooklyn basketball tournament, New York City police said.

A law-enforcement official said police were preparing charges on Sunday night against the suspect in the Saturday night shooting. Mario Lopez, 18, was fatally shot around 6:35 p.m. as he sat on a stoop at 472 Marcy Ave. in the Marcy Houses, a city housing project, with three friends, ages 13, 14 and 15, police said. Police hadn't released their names as of Sunday night.

The 13-year-old victim was shot in the neck and was in critical condition at Bellevue Hospital, authorities said. The 14- and 15-year-old victims were in stable condition at area hospitals.

Police recovered nine shell casings.

The incident was the latest in a string of shootings that injured or killed very young victims in the past two months.

The four victims are believed to be part of a street gang known as the Young Slackers, or YS, that operates in Brooklyn, a law-enforcement official said. The shooter is a known member of the nearby Tompkins Get Money, or TGM, street gang, the official said.

Investigators were trying to determine whether an ongoing clash between the two gangs led to the shooting, the official said.

Police found the suspect after he was identified from a "set book," a collection of mug shots of known gang members at the NYPD's 79th Precinct in the Bedford-Stuyvesant section of Brooklyn, the official said.

The suspect wasn't available for comment. It was unclear if he had retained a lawyer.

The shooting occurred near the Marcy on the Rise basketball tournament, which was launched three years ago as a way to the fight back against violence in the neighborhood during the summer heat.

"We've been doing this tournament for three years without incident," said Andre Stephenson, one of the tournament's commissioners. "We save lives with this."

At Mr. Lopez's home in the Bushwick Houses, family members declined to comment.

Livintong Thormes, a neighbor said Mr. Lopez was "always on his bicycle, playing ball with the other kids....He was a normal kid, he didn't bother nobody."